FIELD: cooling engineering. SUBSTANCE: air cooler comprises pipe provided with finning and cooling jacket. A purifying unit is mounted inside the pipe. The unit has rotatable screw and fixed nut mounted on the shaft bearing support and parallel scrapers. The fins of the pipe are arranged over the screw line whose pitch is equal to the screw pitch. The scrapers have slots of 1-4 mm in width and sharpening whose angle is equal to the angle defined by fins. EFFECT: enhanced efficiency. 5 dwg
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